When you use Cobbl’s Email Invites feature, the guests you invite to your board receive a unique code. They must click the link sent to them to open the board. The advantage is that you can allow only specific users to view and add content to a board.
To use an email invite, sharing must be turned on in the Share menu. Then, go to the bottom of the Sharing screen add and email and assign privileges to the user. You’ll find email invites an quick and more secure method of sharing your board.